An alloy is the homogeneous mixture of:
(a)
A saturated solution of KCl on heating becomes:
(a)
If we dissolve sand into the water, then the mixture is said to be:
(b)
Solubility is usually expressed in grams of the solute dissolved in _____grams of a solvent
(b)
Example of heterogeneous mixture is:
(b)
2 moles of sodium chloride (NaCl) is equal to:
(a)
Molarity of a solution which is prepared by dissolving 40g sodium chloride in 500cm³ of solution is:
(d)
10% (w/w) sugar solution mean that 10 grams of solute dissolved in:
(c)
An example of true solution is:
(c)
Which solution contain more water:
(d)
When a saturated solution is diluted, it change into:
(b)
Butter is example of solution:
(b)
A solution that contain solid solute into liquid solvent is called:
(d)
What is the particle size in suspension?
(d)
What is a solution?
A solution is a homogeneous mixture where the solute is uniformly dissolved in the solvent.
In an aqueous solution, the solvent is:
An aqueous solution always uses water as the solvent.
The component present in smaller amount in a solution is called:
The solute is the substance dissolved in the solvent.
Which of the following is an example of a solid solution?
Brass is a solid-solid solution where zinc is dissolved in copper.
Water is called the "universal solvent" because:
Water's polarity allows it to dissolve many substances, though not all (e.g., oil).
A solution that cannot dissolve more solute at a given temperature is called:
A saturated solution contains the maximum amount of solute that can dissolve at that temperature.
A solution that contains less solute than its saturation capacity is:
An unsaturated solution can dissolve more solute at the same temperature.
Heating a saturated solution can convert it into:
Heating allows more solute to dissolve, creating a supersaturated solution when cooled carefully.
Which of the following is an example of a gas-in-gas solution?
Air is a homogeneous mixture of gases (mainly nitrogen and oxygen).
An example of a liquid-in-liquid solution is:
Alcohol dissolves uniformly in water, forming a liquid-liquid solution.
Molarity is defined as:
Molarity (M) = moles of solute / volume of solution in dm³.
A 1 M solution of NaCl contains:
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. 1 M = 58.5 g/dm³.
What is the molarity of a solution with 20 g of NaOH in 500 cm³?
Moles of NaOH = 20g / 40g/mol = 0.5 mol. Molarity = 0.5 mol / 0.5 dm³ = 1 M.
A 5% (m/v) sugar solution means:
%m/v = mass of solute (g) per 100 cm³ of solution.
Which solution is more diluted?
Lower molarity = more dilute (less solute per unit volume).
The principle "like dissolves like" means:
Substances with similar polarity/intermolecular forces dissolve in each other.
Which of the following does NOT dissolve in water?
Oil is nonpolar and does not dissolve in polar water.
Solubility of most solids in water increases with:
Higher temperature provides more energy to break solute-solute bonds.
Solubility of gases in water decreases with:
Warmer water has less capacity to hold dissolved gases.
Which factor does NOT affect solubility?
Color is a physical property unrelated to solubility.
A true solution is:
True solutions are homogeneous at the molecular level.
Tyndall effect is observed in:
Colloids scatter light due to intermediate particle size (1-100 nm).
Which of the following is a colloid?
Milk is an emulsion (liquid colloid).
Particles in a suspension are:
Suspensions contain large particles that settle over time.
To prepare 100 cm³ of 0.4 M MgSO₄ from 2 M stock solution, the volume needed is:
Using M₁V₁ = M₂V₂: (2 M)(V₁) = (0.4 M)(100 cm³) → V₁ = 20 cm³.
What volume of 0.5 M acid neutralizes 200 cm³ of 4 M base?
Moles of base = 4 M × 0.2 dm³ = 0.8 mol. Volume of acid = 0.8 mol / 0.5 M = 1.6 dm³ = 1600 cm³.
Brass is an example of:
Brass is a homogeneous mixture of zinc (solute) in copper (solvent).
Which gas is the solvent in air?
Nitrogen constitutes ~78% of air, making it the solvent.
Dilution formula is:
The dilution formula maintains mole balance: M₁V₁ (initial) = M₂V₂ (final).
A supersaturated solution can form:
Supersaturated solutions are unstable and crystallize when disturbed.
Which is NOT a property of a true solution?
True solutions don't scatter light (Tyndall effect is for colloids).
Which is a false solution?
Starch forms a colloid (false solution), not a true solution.
The Tyndall effect is due to:
Colloidal particles scatter light, making the beam visible.
Which is NOT a colloid?
Saltwater is a true solution, not a colloid.
Which is a solid-in-gas solution?
Smoke contains solid particles dispersed in air (gas).
Why does benzene not dissolve in water?
"Like dissolves like" — polar and nonpolar substances are immiscible.
If solute-solute forces are weaker than solute-solvent forces, the solution will:
Strong solute-solvent attraction promotes dissolution.
Which is NOT a method to express concentration?
Tyndall effect is a property of colloids, not a concentration unit.
Which is a liquid-in-solid solution?
Butter contains liquid fat in a solid matrix.
The main reason a solute may not dissolve in water is:
Dissolution requires solute-solvent attraction to overcome solute-solute bonds.